[ 41%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/directx.cpp.o
cc1plus: warning: /home/jakub/opencv_repo/build/debug/modules/core/precomp.hpp.gch/opencv_core_Debug.gch: not used because `__cpp_aggregate_nsdmi' not defined [-Winvalid-pch]
In file included from /home/jakub/hpx_repo/hpx/runtime/threads/thread_data_fwd.hpp:15:0,
                 from /home/jakub/hpx_repo/hpx/runtime/threads_fwd.hpp:11,
                 from /home/jakub/hpx_repo/hpx/runtime/threads/thread_helpers.hpp:15,
                 from /home/jakub/hpx_repo/hpx/lcos/local/spinlock.hpp:17,
                 from /home/jakub/hpx_repo/hpx/runtime/naming/name.hpp:12,
                 from /home/jakub/hpx_repo/hpx/runtime/agas/interface.hpp:19,
                 from /home/jakub/hpx_repo/hpx/runtime/applier/apply.hpp:12,
                 from /home/jakub/hpx_repo/hpx/apply.hpp:10,
                 from /home/jakub/hpx_repo/hpx/hpx.hpp:9,
                 from /home/jakub/opencv_repo/modules/core/src/parallel.cpp:101:
/home/jakub/hpx_repo/hpx/runtime/threads/thread_id_type.hpp: In member function ‘constexpr void hpx::threads::thread_id_type::reset() const’:
/home/jakub/hpx_repo/hpx/runtime/threads/thread_id_type.hpp:58:19: error: assignment of member ‘hpx::threads::thread_id_type::thrd_’ in read-only object
             thrd_ = nullptr;
                   ^
/home/jakub/hpx_repo/hpx/runtime/threads/thread_id_type.hpp:56:34: error: invalid return type ‘void’ of constexpr function ‘constexpr void hpx::threads::thread_id_type::reset() const’
         HPX_CXX14_CONSTEXPR void reset()
                                  ^
/home/jakub/hpx_repo/hpx/runtime/threads/thread_id_type.hpp: In function ‘constexpr bool hpx::threads::operator<(const hpx::threads::thread_id_type&, const hpx::threads::thread_id_type&)’:
/home/jakub/hpx_repo/hpx/runtime/threads/thread_id_type.hpp:100:44: error: call to non-constexpr function ‘bool std::less<_Tp>::operator()(const _Tp&, const _Tp&) const [with _Tp = const void*]’
             return std::less<void const*>{}(lhs.thrd_, rhs.thrd_);
                                            ^
/home/jakub/hpx_repo/hpx/runtime/threads/thread_id_type.hpp: In function ‘constexpr bool hpx::threads::operator>(const hpx::threads::thread_id_type&, const hpx::threads::thread_id_type&)’:
/home/jakub/hpx_repo/hpx/runtime/threads/thread_id_type.hpp:106:44: error: call to non-constexpr function ‘bool std::less<_Tp>::operator()(const _Tp&, const _Tp&) const [with _Tp = const void*]’
             return std::less<void const*>{}(rhs.thrd_, lhs.thrd_);
                                            ^
In file included from /home/jakub/hpx_repo/hpx/util/invoke_fused.hpp:16:0,
                 from /home/jakub/hpx_repo/hpx/util/bind.hpp:20,
                 from /home/jakub/hpx_repo/hpx/lcos/detail/future_data.hpp:24,
                 from /home/jakub/hpx_repo/hpx/traits/serialization_access_data.hpp:10,
                 from /home/jakub/hpx_repo/hpx/runtime/serialization/input_container.hpp:15,
                 from /home/jakub/hpx_repo/hpx/runtime/serialization/input_archive.hpp:16,
                 from /home/jakub/hpx_repo/hpx/runtime/serialization/base_object.hpp:13,
                 from /home/jakub/hpx_repo/hpx/runtime/actions/action_support.hpp:17,
                 from /home/jakub/hpx_repo/hpx/runtime/applier/apply_helper.hpp:12,
                 from /home/jakub/hpx_repo/hpx/runtime/applier/apply.hpp:13,
                 from /home/jakub/hpx_repo/hpx/apply.hpp:10,
                 from /home/jakub/hpx_repo/hpx/hpx.hpp:9,
                 from /home/jakub/opencv_repo/modules/core/src/parallel.cpp:101:
/home/jakub/hpx_repo/hpx/util/tuple.hpp: At global scope:
/home/jakub/hpx_repo/hpx/util/tuple.hpp:112:18: error: ‘is_final’ is not a member of ‘std’
              && !std::is_final<T>::value
                  ^
/home/jakub/hpx_repo/hpx/util/tuple.hpp:109:27: error: parse error in template argument list
             typename std::enable_if<
                           ^
/home/jakub/hpx_repo/hpx/util/tuple.hpp:114:13: error: template argument 3 is invalid
             >::type
             ^
/home/jakub/hpx_repo/hpx/util/tuple.hpp:115:9: error: expected unqualified-id before ‘>’ token
         > : T
         ^